quick T-case ident. ?

NP231, aka Command-Trac. Would include a disconnect HP D30, probably 3.07 gearing. Could be D35 or D44 rear, same gearing, with or without Track-Lok LSD.
 
I believe so... the 23 spline units didn't show up 'til mid '89 when the AX-15 replaced the BA10/5, IIRC.
 
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